A stock split isn't a reason to buy shares of a company, but it's a good signal from management.A stock split doesn't change any of the underlying fundamentals of a business. It does, however, signal confidence from management that the stock can keep climbing higher from here. And investors are keen to pick up on that signal.For the most part, management teams have been proven right. Since 1980, the average stock-split stock has gone on to climb more than 25% over the 12-month period following the split, ac ...